Using unsafe blocks in let expressions

[Mark Wielaard]

On Wed, Jul 21, 2021 at 11:09:38PM +0200, Mark Wielaard wrote:
> +  Location locus;
> +  if (!pratt_parse)
> +    {
> +      Location locus = lexer.peek_token ()->get_locus ();

Oops, shadowed locus.  Fixed patch attached, and also at
https://code.wildebeest.org/git/user/mjw/gccrs/commit/?h=let-unsafe


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